VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1243, C1245, C1418

DTC Code DTC Name
C1243 Acceleration Sensor Stuck Malfunction
C1245 Acceleration Sensor Output Malfunction
C1418 Open or Short in Acceleration Sensor Circuit

DESCRIPTION

The skid control ECU (brake actuator assembly) receives signals from the yaw rate and acceleration sensor (airbag sensor assembly) via CAN communication.

The airbag sensor assembly has a built-in yaw rate and acceleration sensor and detects the vehicle's condition using 2 circuits (GL1, GL2).

If there is trouble in the bus lines between the yaw rate and acceleration sensor (airbag sensor assembly) and the CAN communication system, the DTC U0124 (malfunction in CAN communication with the acceleration sensor) is output.

These DTCs are also output when calibration has not been completed.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1243 Acceleration Sensor Stuck Malfunction

Any of the following is detected:


  • Output values of GL1 and GL2 do not change 16 times or more while vehicle speed decreases from 30 km/h (19 mph) to 0 km/h (0 mph).

  • Output values of GL1 and GL2 (front and rear, left and right) are outside permitted output range for 60 seconds or more.

  • Left and right output values of GL1 and GL2 are outside permitted output range for 60 seconds or more.

  • Acceleration sensor (airbag sensor assembly)

  • Acceleration sensor (airbag sensor assembly) circuit

  • Sensor installation
C1245 Acceleration Sensor Output Malfunction At a vehicle speed of 30 km/h (19 mph) or more, the difference between the forward and backward G calculated from the acceleration sensor value and that calculated from the vehicle speed exceeds 0.35 G for 60 seconds or more.

  • Acceleration sensor (airbag sensor assembly)

  • Acceleration sensor (airbag sensor assembly) circuit

  • Sensor installation
C1418 Open or Short in Acceleration Sensor Circuit

One of the following conditions is met when the voltage at terminal IG1 is 9.5 V or higher:


  • The VGS output value of the deceleration sensor is outside the range of 4.4 to 5.6 V for 1.2 seconds or more.

  • The value of GL1 is outside the range of -1.5 to 1.5 G for 1.2 seconds or more.

  • A deceleration sensor open circuit occurs 7 times or more.

  • Deceleration sensor Harness or connector

  • Harness or connector

  • Brake actuator assembly (Skid control ECU)
DTC Detection Conditions: C1243
Vehicle Condition
Pattern 1 Pattern 2 Pattern 3
Diagnosis Condition - - - -
Malfunction Status Output values of GL1 and GL2 do not change 16 times or more while vehicle speed decreases from 30 km/h (19 mph) to 0 km/h (0 mph). ○ - -
Output values of GL1 and GL2 (front and rear, left and right) are outside permitted output range. - ○ -
Left and right output values of GL1 and GL2 are outside permitted output range. - - ○
Detection Time - 60 seconds or more 60 seconds or more
Number of Trips 1 trip 1 trip 1 trip

Tech Tips

DTC will be output when conditions for either of the patterns in the table above are met.

CAUTION / NOTICE / HINT

Note

When replacing the yaw rate and acceleration sensor (airbag sensor assembly), perform zero point calibration and store system information.

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Tech Tips

When U0124 and/or U0126 is output together with C1243 and/or C1245, inspect and repair the trouble areas indicated by U0124 and/or U0126 first.

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PROCEDURE


  1. CHECK AIRBAG SENSOR ASSEMBLY INSTALLATION


    1. Check that the yaw rate and acceleration sensor (airbag sensor assembly) has been installed properly.

      Click here

      OK
      The airbag sensor assembly is tightened to the specified torque.
      The airbag sensor assembly is not installed in a tilted position.

      Note

      Check the yaw rate and acceleration sensor signal after replacement.

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      Tech Tips

      If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing parts.

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      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIRBAG SENSOR ASSEMBLY Click here

    NG

    INSTALL AIRBAG SENSOR ASSEMBLY CORRECTLY Click here